US4892784A - Surface treatment for inhibiting thermal oxidation of polypropylene fabrics - Google Patents
Surface treatment for inhibiting thermal oxidation of polypropylene fabrics Download PDFInfo
- Publication number
- US4892784A US4892784A US07/224,835 US22483588A US4892784A US 4892784 A US4892784 A US 4892784A US 22483588 A US22483588 A US 22483588A US 4892784 A US4892784 A US 4892784A
- Authority
- US
- United States
- Prior art keywords
- polypropylene
- fabric
- aqueous solution
- webs
- spun
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- -1 polypropylene Polymers 0.000 title claims abstract description 64
- 239000004743 Polypropylene Substances 0.000 title claims abstract description 63
- 229920001155 polypropylene Polymers 0.000 title claims abstract description 63
- 230000002401 inhibitory effect Effects 0.000 title claims abstract description 9
- 239000004744 fabric Substances 0.000 title claims description 53
- 230000003647 oxidation Effects 0.000 title claims description 7
- 238000007254 oxidation reaction Methods 0.000 title claims description 7
- 238000004381 surface treatment Methods 0.000 title description 9
- 238000000034 method Methods 0.000 claims abstract description 32
- 230000008569 process Effects 0.000 claims abstract description 31
- GHKOFFNLGXMVNJ-UHFFFAOYSA-N Didodecyl thiobispropanoate Chemical compound CCCCCCCCCCCCOC(=O)CCSCCC(=O)OCCCCCCCCCCCC GHKOFFNLGXMVNJ-UHFFFAOYSA-N 0.000 claims abstract description 24
- 239000003508 Dilauryl thiodipropionate Substances 0.000 claims abstract description 23
- 235000019304 dilauryl thiodipropionate Nutrition 0.000 claims abstract description 23
- 239000007864 aqueous solution Substances 0.000 claims abstract description 20
- 239000002656 Distearyl thiodipropionate Substances 0.000 claims abstract description 19
- 235000019305 distearyl thiodipropionate Nutrition 0.000 claims abstract description 19
- PWWSSIYVTQUJQQ-UHFFFAOYSA-N distearyl thiodipropionate Chemical compound CCCCCCCCCCCCCCCCCCOC(=O)CCSCCC(=O)OCCCCCCCCCCCCCCCCCC PWWSSIYVTQUJQQ-UHFFFAOYSA-N 0.000 claims abstract description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- 238000010438 heat treatment Methods 0.000 claims 4
- 238000009738 saturating Methods 0.000 claims 4
- 238000005406 washing Methods 0.000 abstract description 21
- 238000010525 oxidative degradation reaction Methods 0.000 abstract description 19
- 229920006395 saturated elastomer Polymers 0.000 abstract 1
- 239000000243 solution Substances 0.000 description 12
- 239000003381 stabilizer Substances 0.000 description 12
- 239000000463 material Substances 0.000 description 5
- 229920001410 Microfiber Polymers 0.000 description 4
- 239000003658 microfiber Substances 0.000 description 4
- 230000006641 stabilisation Effects 0.000 description 4
- 238000011105 stabilization Methods 0.000 description 4
- 238000011282 treatment Methods 0.000 description 3
- 239000011324 bead Substances 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 2
- 238000000354 decomposition reaction Methods 0.000 description 2
- 238000006731 degradation reaction Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 230000001954 sterilising effect Effects 0.000 description 2
- 238000004659 sterilization and disinfection Methods 0.000 description 2
- SWZOQAGVRGQLDV-UHFFFAOYSA-N 4-[2-(4-hydroxy-2,2,6,6-tetramethylpiperidin-1-yl)ethoxy]-4-oxobutanoic acid Chemical compound CC1(C)CC(O)CC(C)(C)N1CCOC(=O)CCC(O)=O SWZOQAGVRGQLDV-UHFFFAOYSA-N 0.000 description 1
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 238000004900 laundering Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000004383 yellowing Methods 0.000 description 1
Images
Classifications
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- D06M15/00—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment
- D06M15/19—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment with synthetic macromolecular compounds
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- D06M13/00—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with non-macromolecular organic compounds; Such treatment combined with mechanical treatment
- D06M13/244—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with non-macromolecular organic compounds; Such treatment combined with mechanical treatment with compounds containing sulfur or phosphorus
- D06M13/248—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with non-macromolecular organic compounds; Such treatment combined with mechanical treatment with compounds containing sulfur or phosphorus with compounds containing sulfur
- D06M13/252—Mercaptans, thiophenols, sulfides or polysulfides, e.g. mercapto acetic acid; Sulfonium compounds
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T442/00—Fabric [woven, knitted, or nonwoven textile or cloth, etc.]
- Y10T442/20—Coated or impregnated woven, knit, or nonwoven fabric which is not [a] associated with another preformed layer or fiber layer or, [b] with respect to woven and knit, characterized, respectively, by a particular or differential weave or knit, wherein the coating or impregnation is neither a foamed material nor a free metal or alloy layer
- Y10T442/2549—Coating or impregnation is chemically inert or of stated nonreactance
- Y10T442/2557—Oxygen or ozone resistant
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T442/00—Fabric [woven, knitted, or nonwoven textile or cloth, etc.]
- Y10T442/20—Coated or impregnated woven, knit, or nonwoven fabric which is not [a] associated with another preformed layer or fiber layer or, [b] with respect to woven and knit, characterized, respectively, by a particular or differential weave or knit, wherein the coating or impregnation is neither a foamed material nor a free metal or alloy layer
- Y10T442/2861—Coated or impregnated synthetic organic fiber fabric
- Y10T442/291—Coated or impregnated polyolefin fiber fabric
- Y10T442/2918—Polypropylene fiber fabric
Definitions
- This invention relates generally to treatments for inhibiting thermal oxidation of polypropylene webs and more particularly a surface treatment for inhibiting thermal oxidation of polypropylene webs which can be applied to the polypropylene webs as a rinse after the polypropylene webs have been washed.
- Webs made of polypropylene fibers are useful in a variety of applications in the home, in industry, and in the medical field.
- Such webs can be formed either of discrete microfibers by means of a melt-blown process as taught in U.S. Pat. No. 3,978,185 to Buntin, et al., or can be formed of continuous filaments by means of a spun-bond process as taught in U.S. Pat. No. 3,692,618 to Dorschner, et al. or U.S. Pat. No. 4,340,563 to Appel, et al., all of which patents are hereby incorporated by reference.
- melt-blown process and the spun-bond process are well known in the art, and by varying the process parameters for each process, a wide variety of polypropylene webs can be made having characteristics particularly suitable to a large number of applications.
- additional characteristics for polypropylene webs can be achieved by laminating combinations of melt-blown and spun-bonded polypropylene webs as taught, for example, by U.S. Pat. No. 4,041,203 to Brock, et al. which is hereby incorporated by reference.
- Polypropylene material is, however, unstable and will oxidize and decompose when exposed to air.
- stabilizers are conventionally blended with the polypropylene during the process of manufacturing the polypropylene beads which are used as the starting material for manufacturing polypropylene webs.
- Such internal stabilizers are consumed in the act of stabilization and therefore, all webs composed of polypropylene will sooner or later decompose if exposed to air.
- Decomposition of course, is faster at higher temperatures and with greater surface area. Thermal oxidative degradation of the polypropylene materials is further accelerated by washing the materials which tends to leach the internal stabilizers out of the microfibers.
- polypropylene fabrics often have a very high surface to volume ratio and are often subjected to steam sterilization and drying for extended periods of time, all of which contributes to thermal oxidative degradation.
- polypropylene webs are precluded from some medical uses such as newborn baby blankets which are typically stored in warmers for extended periods.
- thermal oxidative degradation of polypropylene fabrics can be inhibited by treating the surface of the polypropylene fabric with an aqueous rinse solution of dilaurylthiodipropionate (DLTDP), or with an aqueous solution of the related compound, distearylthiodipropionate (DSTDP).
- DLTDP dilaurylthiodipropionate
- DSTDP distearylthiodipropionate
- FIG. 1 is a graph showing the thermal oxidative degradation phenomenon for polypropylene materials as function of the number of washings.
- FIG. 2 is a graph showing the thermal oxidative degradation of polypropylene fabric as a function of the number of washings where the fabric has been treated in accordance with the present invention.
- FIG. 1 is a graph of the data in Table I, below, showing the thermal oxidative degradation of a polypropylene fabric which is not treated in accordance with the present invention.
- the polypropylene fabric is a commercial fabric manufactured by the assignee of the present invention for use in the medical field.
- the fabric comprises a laminate of spun-bond, melt-blown, and spun-bond polypropylene layers.
- the fabric has a very high surface to volume ratio and therefore is particularly susceptible to thermal oxidative degradation.
- the thermal oxidative degradation was accelerated by maintaining the fabric samples at a temperature of 275° F. until the samples decomposed. The number of hours required for decomposition is measured along the ordinate of the graph in FIG. 1, and the number of washings to which each sample was subjected is shown along the abscissa of the graph of FIG. 1.
- the preferred minimum rinse solution for inhibiting thermal oxidative degradation is about 0.6% DLTDP by weight per pound of polypropylene fabric being washed in a commercial washing machine. Such a solution has a concentration of about 5 ppm by volume of DLTDP.
- rinse solutions having 10 ppm DLTDP in solution which is twice the concentration of the preferred rinse solution.
- DSTDP operates within approximately the same concentrations as DLTDP. It is believed that higher concentrations will not provide any significant improvement over the 10 ppm of DLTDP in solution, and at substantially higher concentrations the DLTDP and DSTDP may degrade the other surface properties of the polypropylene.
- the process for treating the surface of the polypropylene fabric with DLTDP or DSTDP simply requires that the appropriate solution of DLTDP or DSTDP be added to the final rinse of the wash cycle of a commercial washing machine in which the polypropylene fabrics are being laundered. While the normal rinse cycle for such a commercial washing machine may last several minutes, it is believed that the advantages of the treatment can be realized by simply dipping the polypropylene web in the properly formulated rinse solution for a time sufficient to saturate the polypropylene web. In addition the rinse solution should be maintained at a minimium temperature of 150° F.
- FIG. 2 is a graph of the data in Table II, below. If the polypropylene web is rinsed with the preferred rinse solution after each washing, the thermal oxidative degradation of the polypropylene fabric at 275° F. is maintained at a constant level of about 28 hours. Such a level is within the same range as unwashed polypropylene fabrics indicating that the surface treatment of the present invention can essentially eliminate the effect of loss of stabilizer due to washing.
- DLTDP and DSTDP are used as internal stabilizers for polypropylene, we believe that the mechanism for surface treatment stabilization is different from the mechanism for internal stabilization.
- other well known internal stabilizers for polypropylene simply do not work when used as a surface treatment.
- Tinuvin 622 manufactured by Ciba-Geigy, is ineffective as a stabilization booster when used as discussed above.
- Tinuvin 756, which is water soluble, provided only 8 hours of protection from thermal oxidative degradation after washing and surface treatment. In addition, it adversely affected the static discharge properties of the web, thereby making the web unsuitable for many medical applications.
- Irgastaab 2002 manufactured by Ciba-Geigy, produced a serious loss of water repellency and provided no better than 8 hours of protection from thermal oxidative degradation after washing and surface treatment.
- Chimosorb 944 manufactured by Ciba-Geigy, provided some protection against thermal oxidative degradation, but not nearly as much as the present invention. Chimasorb 944 also produced a serious loss of static discharge capability in the fabric.
- DLTDP and DSTDP are compatible with other additives which are used as surface treatments in the medical field to provide electrical conductivity and alcohol repellency of polypropylene webs.
Abstract
Description
TABLE I ______________________________________ Hours Until Degradation Number of Washings ______________________________________ 36 0 14 1 8 4 6 8 4 16 2 25 ______________________________________
TABLE II ______________________________________ Hours Until Degradation Number of Washings ______________________________________ 28 0 28 1 28 2 28 4 28 8 28 16 28 25 ______________________________________
Claims (20)
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US07/224,835 US4892784A (en) | 1988-07-27 | 1988-07-27 | Surface treatment for inhibiting thermal oxidation of polypropylene fabrics |
CA000605983A CA1325930C (en) | 1988-07-27 | 1989-07-18 | Surface treatment for inhibiting thermal oxidation of polypropylene webs |
AU38850/89A AU610006B2 (en) | 1988-07-27 | 1989-07-21 | Surface treatment for inhibiting thermal oxidation of polypropylene webs |
MX016937A MX166289B (en) | 1988-07-27 | 1989-07-26 | IMPROVEMENTS TO SURFACE TREATMENT TO INHIBIT THERMAL OXIDATION OF POLYPROPYLENE FABRICS |
KR1019890010741A KR900001921A (en) | 1988-07-27 | 1989-07-27 | Surface treatment to inhibit thermal oxidation of polypropylene webs |
GB8917162A GB2221229B (en) | 1988-07-27 | 1989-07-27 | Surface treatment for inhibiting thermal oxidation of polypropylene webs |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US07/224,835 US4892784A (en) | 1988-07-27 | 1988-07-27 | Surface treatment for inhibiting thermal oxidation of polypropylene fabrics |
Publications (1)
Publication Number | Publication Date |
---|---|
US4892784A true US4892784A (en) | 1990-01-09 |
Family
ID=22842433
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US07/224,835 Expired - Fee Related US4892784A (en) | 1988-07-27 | 1988-07-27 | Surface treatment for inhibiting thermal oxidation of polypropylene fabrics |
Country Status (6)
Country | Link |
---|---|
US (1) | US4892784A (en) |
KR (1) | KR900001921A (en) |
AU (1) | AU610006B2 (en) |
CA (1) | CA1325930C (en) |
GB (1) | GB2221229B (en) |
MX (1) | MX166289B (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6245401B1 (en) | 1999-03-12 | 2001-06-12 | Kimberly-Clark Worldwide, Inc. | Segmented conformable breathable films |
US20060212072A1 (en) * | 2005-03-16 | 2006-09-21 | Cuevas Brian J | Polyolefin sutures having enhanced durability |
WO2013082381A1 (en) | 2011-12-02 | 2013-06-06 | W. L. Gore & Associates, Inc. | Heat-stabilized composite filter media and method of making the filter media |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR20000024633A (en) * | 2000-02-22 | 2000-05-06 | 김영진 | Compress light film |
KR20020018333A (en) * | 2000-09-01 | 2002-03-08 | 이윤화 | Producing method of surface coating fluid for textile and its coating method |
Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3682696A (en) * | 1969-11-21 | 1972-08-08 | Tatsuta Densen Kk | Method for producing anti-static paper |
US3692618A (en) * | 1969-10-08 | 1972-09-19 | Metallgesellschaft Ag | Continuous filament nonwoven web |
US3932330A (en) * | 1974-08-01 | 1976-01-13 | Gulf Research & Development Company | Adhesive composition |
US3978185A (en) * | 1968-12-23 | 1976-08-31 | Exxon Research And Engineering Company | Melt blowing process |
US3993655A (en) * | 1973-12-10 | 1976-11-23 | Ciba-Geigy Corporation | Stabilizers for synthetic polymers |
US4041203A (en) * | 1972-09-06 | 1977-08-09 | Kimberly-Clark Corporation | Nonwoven thermoplastic fabric |
US4115605A (en) * | 1975-08-04 | 1978-09-19 | Kimberly-Clark Corporation | Anti-static compositions comprising a copolymer or perfluoroalkyl acrylate and polyoxyalkylene acrylate, wetting agent, and a salt selected from the group consisting of potassium acetate and lithium chloride in aqueous medium |
US4340563A (en) * | 1980-05-05 | 1982-07-20 | Kimberly-Clark Corporation | Method for forming nonwoven webs |
-
1988
- 1988-07-27 US US07/224,835 patent/US4892784A/en not_active Expired - Fee Related
-
1989
- 1989-07-18 CA CA000605983A patent/CA1325930C/en not_active Expired - Fee Related
- 1989-07-21 AU AU38850/89A patent/AU610006B2/en not_active Ceased
- 1989-07-26 MX MX016937A patent/MX166289B/en unknown
- 1989-07-27 GB GB8917162A patent/GB2221229B/en not_active Expired - Lifetime
- 1989-07-27 KR KR1019890010741A patent/KR900001921A/en not_active Application Discontinuation
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3978185A (en) * | 1968-12-23 | 1976-08-31 | Exxon Research And Engineering Company | Melt blowing process |
US3692618A (en) * | 1969-10-08 | 1972-09-19 | Metallgesellschaft Ag | Continuous filament nonwoven web |
US3682696A (en) * | 1969-11-21 | 1972-08-08 | Tatsuta Densen Kk | Method for producing anti-static paper |
US4041203A (en) * | 1972-09-06 | 1977-08-09 | Kimberly-Clark Corporation | Nonwoven thermoplastic fabric |
US3993655A (en) * | 1973-12-10 | 1976-11-23 | Ciba-Geigy Corporation | Stabilizers for synthetic polymers |
US3932330A (en) * | 1974-08-01 | 1976-01-13 | Gulf Research & Development Company | Adhesive composition |
US4115605A (en) * | 1975-08-04 | 1978-09-19 | Kimberly-Clark Corporation | Anti-static compositions comprising a copolymer or perfluoroalkyl acrylate and polyoxyalkylene acrylate, wetting agent, and a salt selected from the group consisting of potassium acetate and lithium chloride in aqueous medium |
US4340563A (en) * | 1980-05-05 | 1982-07-20 | Kimberly-Clark Corporation | Method for forming nonwoven webs |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6245401B1 (en) | 1999-03-12 | 2001-06-12 | Kimberly-Clark Worldwide, Inc. | Segmented conformable breathable films |
US20060212072A1 (en) * | 2005-03-16 | 2006-09-21 | Cuevas Brian J | Polyolefin sutures having enhanced durability |
WO2013082381A1 (en) | 2011-12-02 | 2013-06-06 | W. L. Gore & Associates, Inc. | Heat-stabilized composite filter media and method of making the filter media |
US9073061B2 (en) | 2011-12-02 | 2015-07-07 | W. L. Gore & Associates, Inc. | Heat stabilized composite filter media and method of making the filter media |
Also Published As
Publication number | Publication date |
---|---|
GB8917162D0 (en) | 1989-09-13 |
CA1325930C (en) | 1994-01-11 |
KR900001921A (en) | 1990-02-27 |
MX166289B (en) | 1992-12-28 |
GB2221229A (en) | 1990-01-31 |
AU610006B2 (en) | 1991-05-09 |
AU3885089A (en) | 1990-02-01 |
GB2221229B (en) | 1991-11-13 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: KIMBERLY-CLARK CORPORATION, 401 NORTH LAKE STREET, Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNORS:REEVES, WILLIAM G.;ROEDER, ROBERT J.;DUELLO, LEONARD E.;REEL/FRAME:004919/0779 Effective date: 19880727 |
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CC | Certificate of correction | ||
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Free format text: PAYOR NUMBER ASSIGNED (ORIGINAL EVENT CODE: ASPN); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY |
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FPAY | Fee payment |
Year of fee payment: 4 |
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REMI | Maintenance fee reminder mailed | ||
LAPS | Lapse for failure to pay maintenance fees | ||
FP | Lapsed due to failure to pay maintenance fee |
Effective date: 19980114 |
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STCH | Information on status: patent discontinuation |
Free format text: PATENT EXPIRED DUE TO NONPAYMENT OF MAINTENANCE FEES UNDER 37 CFR 1.362 |